Recently there has been an increase in interest in hemispheric-scale teleconnections. The circumglobal teleconnection pattern (CGT) is a special zonal phase of the jet whereby disturbances originating near the South Asian jet entrance, or within the jet, remain trapped and can propagate around the globe. Recent studies have shown that this CGT pattern affects climatic conditions across the entire hemisphere, from North America to Europe to South Asia. The CGT is generally thought of as an internal mode of atmospheric variability, but this study aims to examine whether the CGT can be forced during the boreal winter when the jet is at its peak amplitude. To accomplish this, we make use of a simple general circulation model to test whether an imposed diabatic heating anomaly in the tropics can force the CGT. Results from the simple model show that heating over the equatorial Indian Ocean and cooling over the western Tropical Pacific Ocean can drive a CGT-like pattern. Lagged regression using pentad reanalysis data supports these results, showing that a dipole convection pattern in these same regions precede the CGT.

近来，对半球形规模的远程连接的兴趣增加了。环全球遥连接型式（CGT）是喷流的一个特殊的纬向相，据此，源自南亚喷流入口附近或喷流内部的干扰仍被捕获并可以在全球范围内传播。最近的研究表明，从北美到欧洲再到南亚，这种CGT模式影响着整个半球的气候条件。CGT通常被认为是大气变化的内部模式，但是本研究旨在研究在喷气冬季处于峰值振幅时，是否可以在寒冬期间强制使用CGT。为此，我们使用一个简单的通用循环模型来测试热带地区强加的绝热加热异常是否可以强迫CGT。简单模型的结果表明，赤道印度洋上空的加热和热带西太平洋上空的冷却可以驱动类似CGT的模式。使用五单元组再分析数据的滞后回归分析支持了这些结果，表明在这些相同区域中的偶极对流模式在CGT之前。